This site is all about building ace SQL queries.
Move MySQL data to /home on Debian
Resync mysql replication including MyISAM databases
SSH Tunnel to MySQL Database
MariaDB in Debian Stretch fix for no password
MaxScale Configuration Guide
Restarting MySQL replication after an error
Configuring MySQL for UTF-8
Checking for problems in my.cnf
How to change collation for all columns in a MySQL table